.centered {
    display: block;
    margin: 0 auto 40px;
    max-width: 800px;
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.row {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

@media (max-width: 600px) {
    .row {
        padding: 10px;
    }
}